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Reversion of natural ageing and restoration of quick bake-hardening response in Al-Zn-Mg-Cu alloy

Journal of Materials Science & Technology 2021年第36期95卷 88-94页

作者： Chunhui Liu Zhuangzhuang Feng Peipei Ma Yihui Zhou Guohui Li Lihua Zhan Light Alloy Research Institute of Central South University State Key Laboratory of High-Performance Complex ManufacturingChangsha 410083China School of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China

The high-strength Al-Zn-Mg-Cu alloy provides much better dent resistance and weight-reduction potential compared to the conventional Al alloys used for the automobile body ***,natural ageing(NA)significantly reduces the formability of Al-Zn-Mg-Cu *** reversion of natural ageing has been systematically investigated by hardness test,tensile test,differential scanning calorimetry(DSC)and transmission electron microscopy(TEM).Substantial reversion of natural ageing and thus hardness decrease occurs immediately upon thermal treatment at 120–210℃in an Al-Zn-Mg-Cu *** the hardness of the most reverted state decreases with increasing temperature,the lowest hardness is still higher than the as-quenched state by 30 *** revealed by the complementary DSC and TEM observations,this is ascribed to the synchronization of the dissolution and the re-precipitation of the solutes in the NA clusters during reversion *** at 180–210℃for less than 30 s leads to a hardness decline of 40 *** hardening kinetics during NA after reversion is slower than that during first-time NA due to the reduced vacancy *** ageing at 180℃for 30 min after secondary NA of less than 24 h induces intensive precipitation of plate-like pre-ηphases and a giant strength increase of 188–204 *** use of high strength Al-Zn-Mg-Cu alloy in automobile body panels could be realized by appropriate reversion treatment improving the formability and the quick bake hardening response.

关键词： Reversion natural ageing Bake-hardening response Vacancy Al-Zn-Mg-Cu alloy

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natural-ageing-enhanced precipitation near grain boundaries in high-strength aluminum alloy

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Journal of Materials Science & Technology 2020年第11期42卷 107-113页

作者： Peipei Ma Chunhui Liu Qiuyu Chen Qing Wang Lihua Zhan Jianjun Li Light Alloy Research Institute of Central South University State Key Laboratory of High-Performance Complex ManufacturingChangsha410083China School of Mechanical and Electrical Engineering Central South UniversityChangsha410083China

Artificial ageing above 165℃directly after quenching induces the formation of^50 nm wide precipitatefree zone(PFZ)and^100 nm wide precipitate-sparse zone(PSZ)consisting of coarse precipitates with a gradient in size and density toward the grain center in a commercial Al-Zn-Mg-Cu *** the grain size decreasing,the fraction of PFZ and PSZ in a grain becomes larger and could even occupy the entire volume of the *** undesirable microstructure near the grain boundary is mitigated substantially by natural pre-ageing,leading to an exceptional enhancement of the age hardening potential at elevated *** ageing could fundamentally alter the precipitation near grain boundary,and is a promising method to optimize the precipitation hardening in high strength aluminum alloys with unconventionally small grains.

关键词： Precipitation hardening Grain boundary natural ageing Grain size Aluminum alloy

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